Bell, S. A., & Morse, S. A. (2008). Sustainability indicators: Measuring the immeasurable? (Rev.ed.).
Chicago Style aipamenaBell, Simon; Author, and Stephen; Author Morse. Sustainability Indicators: Measuring the Immeasurable? Rev.ed. London, Earthscan, 2008.
MLA aipamenaBell, Simon; Author, and Stephen; Author Morse. Sustainability Indicators: Measuring the Immeasurable? Rev.ed. 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.